Upgraded Heavy-Duty Aluminum Bullet Super Tweeter - Powerful 200 Watt Peak 2.5k - 20kHz Frequency Response and 4 Ohm w/ 100dB (1w/1m) Sensitivity and 1.5&rdquo; Kapton Voice Coil - Lanzar Optidrive OPTIBT25 2.5k - 20 kHz FREQUENCY RESPONSE: Lanzar, optidrive tweeter speaker has neodymium magnet structure and frequency response that complete the package. Also, pack with exceptional 100dB (1w/1m) decibel sensitivity POWERFUL 200 WATTS: This bullet super tweeter speaker provide up to 200 watts peak power because it is equipped with neodymium housed structure. It's all housed in durable aluminum die-cast frames 4-OHM MIN IMPEDANCE: This upgraded car tweeter has 4-ohm impedance rating that compensates the undersized wire found in many of todays cars. It has ferrofluid enhanced voice coil that ultimately reduces distortion so you can enjoy a crisp sound 1.5 KAPTON VOICE COIL: Lanzar tweeter are capable of 1.5 higher or elevated temperature strength and fatigue properties. It will increase performance and efficiency of heavy-duty play time through lower weight and higher operating temperatures SIZE: Lanzar upgraded car speaker measures 3.98'' in overall diameter with a mounting depth of 2.30''. The heavy-duty die-cast frame and neodymium magnet structure provides a strong foundation for full range car tweeter speaker from Lanzar